(19)
(11) EP 1 450 362 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.01.2007 Bulletin 2007/02

(43) Date of publication A2:
25.08.2004 Bulletin 2004/35

(21) Application number: 04004964.5

(22) Date of filing: 27.04.2000
(51) International Patent Classification (IPC): 
G11B 20/00(2006.01)
G11B 7/007(2006.01)
G11B 23/28(2006.01)
 G11B 20/12(2006.01)
G11B 19/12(2006.01)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 28.04.1999 JP 12210499
10.05.1999 JP 12819799
21.10.1999 JP 29963599

(62) Application number of the earlier application in accordance with Art. 76 EPC:
00108910.1 / 1058254

(71) Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Kadoma-shi, Osaka 571-8501 (JP)

(72) Inventors:
  • Nagai, Takahiro
    Asahi-ku,Osaka-shi, Osaka 535-0031 (JP)
  • Ishihara, Hideshi
    Katano-shi Osaka 576-0054 (JP)
  • Takagi, Yuji
    Hirakata-shi Osaka 573-0065 (JP)
  • Yumiba, Takashi
    Kyotanabe-shi, Kyoto 610-0354 (JP)
  • Shoji, Mamoru
    Sakai-shi Osaka 591-8032 (JP)
  • Oshima, Mitsuaki
    Kyoto-shi Kyoto 615-8074 (JP)
  • Ohara, Shunji
    Higashiosaka-shi Osaka 578-0963 (JP)
  • Ito, Motoshi
    Osaka-shi Osaka 536-0001 (JP)
  • Ishida, Takashi
    Yawata-shi Kyoto 614-8331 (JP)
  • Nakamura, Atsushi
    Moriguchi-shi, Osaka 570-0002 (JP)
  • Jahana, Shoji
    Yokohama-shi Kanagawa 226-0015 (JP)
  • Nakata, Kouhei
    Osaka-shi, Osaka 536-0002 (JP)

(74) Representative: Eisenführ, Speiser & Partner 
Patentanwälte Rechtsanwälte Postfach 10 60 78
28060 Bremen
28060 Bremen (DE)

   


(54) Optical disk, optical disk recording and reproducing apparatus, method for recording, reproducing and deleting data on optical disk, and information processing system


(57) An optical disk of recording type on which data is recordable is provided which includes a data recording and reproducing area for recording data therein and reproducing data therefrom, and a read-only disk identification information area for recording disk identification information for identifying the optical disk therein. In the optical disk, the disk identification information is formed by removing a reflection film formed on the optical disk in a strip shape. The disk identification information includes an inherent disk identifier for each optical disk, and the data recording and reproducing area includes an area for recording therein encrypted data, which is encrypted using information including the disk identification information for identifying the optical disk as a key.







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